Improvement in seed-drills



PATENTED APR. 13, 1858' J HARRIS SEED DRILL.

I No. 19,924,

UNITED STATES PATENT OFFICE.

mo. HARRIS, or .SHIPPENSBURG, PENNSYLVANIA.

IMPROVEMENT'IN SEED-DRILLS.

' specification forming part of Letters Patent No. 19,924, dated April 13, 1858.

To all whomttmay concern:

Be it known that I, JOHN HARRIS, of Ship-' Before stating the nature of my improve ment I deemit proper, in view of the factot' no less than five contrivances having been patented for accomplishing the same end which my invention is designed to effect, to refer to those devices which approximate the nearest to my arrangement, in order to illustrate its novelty and superior utility over the same.

In the device patented by J. D. Willonghby, 1848, the drill-tooth is hinged or pivoted directly to the rear 'end of along-flatrelief spring-bar; and in the device patented by Jacob Pierson a spiral spring is placed on top of the bar to which the tooth is hinged. To I this spring an elbow-lever is -connected,said lever also being connected to the lower part of the tooth.

The object of myfimprovement is'to avoid the necessity of attaching the tooth to the relief-bar by a hinge-joint. 4

v The natureof my invention consistsin having the spring-bar, which is attached fast to the upper pertof-the main relief connecting-bar of thedrilttooth by one; end, loosely connected at its other end to'the upper end of the drilltooth by means of a curved hook on thetooth and a slot in itself, as presently described. By this simple arrangement provision is made without the necessity of forming a hinge-joint in the upper connecting-bar for the drill-tooth yielding when it comes in contact with stones and stumps, and thus save itself from being broken, and then of'springing forward to its original position.

Fig. 3 is a longitudinal section or To enable others skilled in the art to make and use my invention, I will proceed. to describe its construction and operation.

A represents the drill tooth. Its upper end terminates in a curved scroll or book, a, as

shown. 1 B is the main connecting or supporting bar, to which the tooth is pivoted, as shown at U.

D is thespring relief-bar. It is shaped as shown, and attached to the upper forward part of the main connecting orv supporting bar at b and c.

E is an oblong slot cut through the rear end of the relief-bar D. Through this slot the hook end a of the tooth passes, as shown. By

thus attaching the tooth to the relief-bar by the. .hookandslot. it.,1n.ay .be evident. that...the tooth has a chance to spring back, the slot al-' lowing this, and in springing back the curved or hook portion a of the tooth will bear upon the ends of the springand depress the spring sufficiently to bring the elasticity of the same into play, and consequently when the obstruction which was in the way of the tooth is passed the tooth will, by reason of the spring seeking to assume'a right line, be thrown forward by the spring to its original position.--.

This is an erzceedingly simple device and is free from all liability of derangement, and-in case it should be broken can be replaced by a country blacksmith or even the farmer himself.

What I claim as my invention, and desire to secure by Letters Patent, is

Having the spring bar which is attached fast to the upperpart of the main relief Y connecting-bar B of the drill-tooth A by one end loosely connected at its other end to the upper end of the drill-tooth by means of a. curved hook on the tooth and a slot in itself,

substan tially as and for the purposes set forth.

The above specification oflny improvement in seed-drill-teeth attachments signed by mef this 4th day of March, .A. 13.1858. I "JOHN HAnms.

Witnesses:

R. P. MGCLURE", S. M. STUMBAUGH. 

